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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 1
Status report :Part I : SymOct 200GeV
Part II : Cumulants Analysis
Inkyu Park
University of Rochester
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 2
Part I : SymOct 200GeV
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 3
Analysis chain
• Select data, and vertex cut at 2s in Vx, Vy and -38<Vz<-30cm
• SiHit energy calibration in sensor-by-sensor basis
• Make Hit density plot and define Dead/Hot pixels
• Correct Dead pixels by mirroring, or reject whole column
• Calculate Weighting matrix and Poisson weight
• Define sub-events, and get reaction plane resolution
• measure v2 and correct resolution
• Do MC study and estimate v2 suppression
• Correct suppression in Data
• Do various systematic error study
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 4
Data set
• 200GeV Data : OFFZ vertex events dedicated runs, 35K
B0 : 9051-9056
B- : 9057-9060
B+ : 9063-9065
• 200GeV MC 5% : 6K events (B-,B+ not requested)
B0 : 5731, 5732
• 200GeV MC Triangular : 35K events
B0 : 5706, 5707, 5708
B- : 5721, 5722
B+ : 5719
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 5
QM2002 Plots / Systematics1) SiHits vs MultHits
2) Hit definition
(40keV,50keV, 60keV)
3) Sub-event definition
(0.1, 0.5, 1.0, 1.5 <h<2.0)
4) Beam orbit (1.5s, 2s, 3s)
5) Alignment (Vx=Vy=0)
6) Suppression (Triangular, 5%Flat)
7) Dead channel correction ON/OFF
8) Weighting matrix ON/OFF
9) CMN fix ON/OFF
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 6
V2 vs cen with SpecFlow
SpecFlow points are taken from QM2002 results
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 7
V2(eta) vs three bins of centrality
SpecFlow lines are obtained from Carla’s June 13 Web page
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 8
Ratios
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 9
What should be done for QM2004?
• Numbers are pretty much settled down and shall not be easily changed unless we found any missing systematic sources.
• What systematics should be studied more?
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 10
Part II : Cumulants Analysis
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 11
Cumulants Math
M
hMn nynxG
1
1 )))sin(2)cos(2(1(
)1( /1}{}{ Mkn
kn GMC
2033
122
31
{2}2 /)3(v rCCC
4 40321
{4}2 /)45(2v rCCC
6 60321
{6}2 /)33(6v rCCC
for the integrated flow
M
hnn Gnxg
1
)cos()(
M
hnn Gnyg
1
)sin()(
for the differential flow
For each event, loop over hits and calculate a generating function Cumulants
generating function
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 12
Data set
We use only
• 130GeV Data : /phobos/data2001/pr00/COLLISION/PR00/BZEROMB
• 130GeV MC 5% : BZERO 5735, 5736 (SMV0_4)
• 130GeV MC Triangular : BZERO 5448 (SMV0_5)
200GeV data are not yet analyzed…
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 13
Sub-detector setup
Detector ID
19 sub-detectors work independently in Cumulants
Integrated Flow comes from Octagon
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Method I
Method II
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 14
Problem with 6-sensor configuration
• When two holes exist, ie, 6 and 9, we have problems.
• Jean-Yves doesn’t yet understand what’s wrong with our plots
• For now, we can only accept Method II
Method I
Method II
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 15
Proposed sub-detector setup
Octagon is homogeneous (4 sensors) along the beam axis, thus we can now define pseudo-rapidity bin instead of sub-detector bin for better eta value representation.
-5.5 -4.0 -3.5
Eta bins
+3.5 +4.0 +5.5-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 +0.5 +1.0 +1.5 +2.0 +2.5 +3.0
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 16
Poisson weighed differential flow
Differential flow with Poisson weighting Seems to work
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 17
First look at 130GeV Data
Very similar result to PRL!
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Sep. 3, 2003 PHOBOS Flow meeting (Inkyu Park) 18
To be done
• 130GeV BZERO Triangular MC (Increase STAT)
• Confirm suppression correction
• Confirm 130GeV PRL result
• Apply for 200GeV Data and MC
• v2 3-centrality-bin analysis
• v1 independent check
• hopefully get 4 particle cumulants results QM2004